Re: [patch 21/21] slab defrag: Obsolete SLAB

Pekka Enberg
2008-05-15T20:33:20Z

Matthew Wilcox wrote:
> This is rather interesting. Since Christoph refuses to, here's my
> results with 8f40f67, first with slab:
>
> Now, change the config to slub:

[snip]

> and we get slightly better results:
>
> willy@piggy:~$ sudo ./io-gen -d /dev/sda -j4
> CPU 0 completed 1000000 ops in 45.848 seconds; 21811 ops per second
> CPU 2 completed 1000000 ops in 50.789 seconds; 19689 ops per second
> CPU 3 completed 1000000 ops in 55.876 seconds; 17896 ops per second
> CPU 1 completed 1000000 ops in 56.941 seconds; 17562 ops per second
> willy@piggy:~$ sudo taskset -p 1 1001
> pid 1001's current affinity mask: f
> pid 1001's new affinity mask: 1
> willy@piggy:~$ sudo ./io-gen -d /dev/sda -j4
> CPU 2 completed 1000000 ops in 45.713 seconds; 21875 ops per second
> CPU 0 completed 1000000 ops in 47.020 seconds; 21267 ops per second
> CPU 3 completed 1000000 ops in 58.692 seconds; 17038 ops per second
> CPU 1 completed 1000000 ops in 60.389 seconds; 16559 ops per second

Slabinfo -A -r before and after the run would be nice (you
CONFIG_SLUB_STATS and Documentation/vm/slabinfo.c for the latter). A
separate oprofile would be nice as well. Thanks!

Pekka